best one I know of is English+ in Jonggak. Take the #1 line to Jonggak station (one stop past city hall) go out exit #1 walk past the LG store, the KFC towards the Kyobo bookstore right before you get to the first street where there is a pharmacy and a Ngong Hyup bank it'll be on your right. They just rennovated and it has lots of kids stuff

How about teacher supply stores in Jeollanamdo? I need some posters and other classroom decorations for a junior high classroom.

there is a store right near my unis other campus here in Gwangju. Called Kidari English Shop its on the road from downtown to the airport near Sangmu Jigu Phone# 062-384-0509. Know they are closed Sundays though

There is a good one above the Marche Restaurant at the Gangnam Subway stop. Lots of good books, sometimes they have posters, banners. Buy a membership and you receive 20% all purchases. I am a shopaholic for teacher's books so it is worth it. They have felt materials made in China that are really nice.